Jakarta Program Of Southeast Asian Studies 1994,
Buku Teks
Philippines : University of The Philippines Asian Center
Majalah, Jurnal, Buletin
Lev, Daniel S., author
University washington press, 2011
Buku Teks
Tarling, Nicholas, author
New Zealand Asia Institute , 2000
Buku Teks
Solidum, Estrella D., author
University of the Philippines Press, 1974
Buku Teks